The difference between double tube plate heat exchangers and single tube plate heat exchangers

The difference between double tube plate heat exchangers and single tube plate heat exchangers

A heat exchanger is a widely used waste heat utilization equipment, and its heat transfer can be regarded as stable comprehensive heat transfer through walls, because during the working process, the temperature of the cold and hot gases on both sides can be considered stable and does not change with time. It can be a separate device or a component of a certain process equipment.

1, Structural differences

A double tube plate heat exchanger is a heat exchanger with a certain gap at one end of the two tube plates or equivalent to a certain gap between two tube plates. This heat exchanger adopts a fixed tube plate structure, and the tube bundle cannot be removed for cleaning, which is different from a single tube plate heat exchanger. At the end of the heat exchange tube, there is a tube plate called the outer tube plate, which is connected to the heat exchange tube and the flange of the tube box. There is also an inner tube plate near the end of the heat exchange tube. A pressure free isolation chamber is formed between the outer and inner tube plates.

2. Single tube plate heat exchangers are common equipment in use. In addition to gasket bolt flange joint sealing leakage, there may also be nozzle leakage and welding cracks on the tube plate. The nozzle leakage of the single tube plate heat exchanger mostly occurs at the welding arc, and when the welding arc is closed, the gas does not discharge, resulting in sand holes. But the double tube plate heat exchanger has inner and outer double-layer tube plates. If the inner tube plate hole leaks, there is also protection from the outer tube plate.

Spiral wound tube heat exchangers have the following advantages:

1) When the flow rate is small or the required heat transfer area is small, it can reduce the occupied space and save infrastructure installation and maintenance costs.

2) Due to the higher heat transfer coefficient of spiral tubes than straight tubes, they can be used for heating or cooling high viscosity fluids.

3) The flow inside a spiral wound tube heat exchanger can be considered as countercurrent flow.

4) Due to the fact that the heat transfer tube is a serpentine coil with spring action, there is no damage or leakage caused by thermal stress.

5) Compact structure, easy installation, low tendency for scaling, self-cleaning effect, reducing equipment maintenance time and energy consumption.

The spiral wound tube heat exchanger structure not only prolongs the length of the tube side for sufficient heat exchange, but also ensures that the shell side fluid forms a strong turbulent state, enhancing heat transfer. The heat exchange ability is also relatively strong, and I hope this explanation can help you master the basic knowledge of the equipment.

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